Machine for bending metallic tubes.



No. 847,094. PATENTED 12, 19.07.

F. V. M. MONNET & E. J. A. MOYNE.

MACHINE FOR BENDING METALLIC TUBES. APPLICATION FILED 00121, 1906.

2 sums-ennui.

No. 847,094. PATENITED MAR. 12, 1907-.

F. v. M. MOjNNET & E. J. A. MOYNE. v MACHINE FOR BENDING METALLIC TUBES- APPLIOATION FILED OUT. 1, 1906.

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UNKTED STATES;

FLEUEY VICTOR MARIUS MONNET Ci @FFECE.

OF PARIS, FRANCE. j

Macrame Foe sesame t ematic runes.

Specification of Letters Patent.

Patented March is. 190% Application filed October niece. fieriel in). scenic.

To all whLont if puny concern:

Be it known that we, FLEURY Vroron My aiUs MONNET, mechanical engineer, and EMILE JULIEN AUcUsTn MOYNE, mechanical engineer, citizens of the Republic of France, both residing at 11 Rue Torri'celli, Paris, France, have invented new and useful Improvements in Machines for Bending Metal- Tubes, of which-the following is a specification.

The present invention relates to the bend" ing of metallic tubes, and more particularly thin tubes, to a short radius of curvature Its object consists in a machine or'apparatus cf the kind wherein; a mandrel placed inside the tube to be bent is utilized in effecting the bending.

' In the apparatus herein described the tube I to be bent is externally held by a former rotatable around a fixed center or axis and by a guide-piece rectangular in shape, which is stationary during the bending operation, the

'bench,'a bed, or the like,

arrangement'being such that the distance -.between the point of application of the rethe axis of rotation sultant of pressures an ofthe rotatable former can be varied according to the size of tubetobe bent.

In the accompanying drawings, Figure 1 is a planet the appliance, partly a section, on the line'l 1 of Fig 2; Fig. 2 isa 'sectidn on the broken line 2 2 of Fig. 1 looking in the direction of the arrows. Fig. 3 is asection on th'eline 3 3 of Fig. 1. Fig.4 on a larger scale is a detail of the tube and the mandrel with jointed sections in longitudinal sectionessentially, of a trunnion 0 may be varied as well as that of the guide-piece.d,.-which pivots on the latter, in order to enable bends to be effected'according. to different radii. The guide-piece d is rectangular inshape' and has an acting face din the form of a straight groove.

The frame a carries at its free end a trunmen 2, which constitutes the center around which the former f rotates. The drawing shows byway of an example a former, adapted for two radii of curvature; but this is not absolutely, necessary, and. the former ments have any sort of arrangement. It is formed on its circumference with a groove f which, as well as the'lateralgrooves d of the guide-piece d, must'have the same diameter as the" tube 9 to be bent, the tube being applied to said groove j" by means of a bearing which is means of a stirrup h, keyed at W, and is providedwith a set-screw h Into the tube 9 is introduced a suitable mandrel, preferably consisting of arigid cylindrical piece i, from which extend individually deformable rings or segments '5 i having spherical bearing-surfaces, and is terminated in a knob i the whole being held together by threaded rods i 2?, so as'toform a universal joint; and by nuts i i, having spherical bearing-surfaces and constitutin I a jointed system, (see 4,) which is capa 1e of taking all required curvatures in all direc tions. This mandrel is inserted into the tube by means of a screw-threaded rod which engages the end of rigid piece i, an is held fast at its other end by a brace k (which itself is supported at one end on the trunnion c of the carriage c) andby anadjustable rod;

m, which is'j'ointed at one end at m? to the other end of the said brace andds formed at its other end with a slot m", engaging a setscrew n, which is fixed to the base-plate a of 'the frame a.-- a

A regulating-unto, which screws onto' the threaded end of the rod 7' and beg? on the brace 1c, allows of the position of s rod beingregulated, and consequently also the position oi-the mandrelcarried'by it.

All being so arranged and rotary move-.

AND EMELE JULIEN AUGUSTE MOYNE,

may according to practical needs and require held against the former f by.

merit being imparted to the former f round the arise in the direction of the arrow 2 (by means of the lever p, which pivots on theaxis .e. and the stud p,of which engages a hole 1' in said former) the tube 9 follows this rotary IOO' movement; but since precisely at the point -where the bending begins rthat is to say, in

the plane.:c'y.the tube is {supported by the v.

mandrel i '2' i i a drawingeout action ofthe exterior fibers and a compressing action of the inner fibers ofthe metal of 'the tube are produced, and the latter slides on the mandrel as being bent, while the jointed rings of said mandrel in' accompanying the tube 9.;

during the operation beyond the plane at y i jointed rings might occur, especially in th case of thin tubes with short radii of curvature, owing to the traction strain oxertedon the exterior fibers suspected to the drawing jq action, and retain'jthe section o a b .fl fl torevolvergund t e' '9 s; wi h d f m ti -Wh'at we do claim asour niventxon, and de--l 'Itis' seen that owing to the rectangular lret' ur by te s a t, 4 v form of the guide-piece (lthe tube gis'in con- E -1. an appliance for bend ngtubes, the tact with said guide-piece all along t j combmiltmn of b fi g j 'ce t s d straight portion of'the acting face (1, (3118i bilge; alfs m tmg dg q r nof being in contact with its guide at'onepoint, l y; means'fol' dips g S l s w g as would be the case if instead of using a'rec y, means lg dmg 8 g Q'SW H X tangular'guide-pieee a roller were usedas in u gt b g op r ti n gyna drel, a certain prior machines.) New, this portion Q D lj d on Q b rv' p g, can always be made long enoughso that its I b6 Q Q former, f means 5 I guiding action and support .of the tube is can Saul lmfi substantlally as f ried toapoint at which the drawing action rscl'lbed- A i y 4 (ta which the metallic fibers of that part of 2 in an appliance for bending tubeshlh the tubGwhiChAS exterior to the curvature o f a w smda e iwm are subjected, owing to the tube g'b eing bent said'baS-e W Q fi W ginde honzon' round the formerf) is" hardly e t-ale; tally, f ef tms-a n e e to "The result obtained is that any crowding to 3 gulde: baa PP Fim P Q-h gether or the metallic fibers-is avoided hswen m wed 9 9 and and f r PP r es- I as any rollingaction-or-drawing ofthe metal d having '9 8 w i 9 4 on the exterior of the tube at. the curvature adapted 5 hold m Stationary @9 1 =as, wou'l d be iroduced by using a roller asa 2 p Operat-mn n l gf I i Particularly-in the case of thin tubes y W 3 Ont .l m If anger with'small radii of curvature. A bent tube fi 3 5 asei a a m er 'is thus-obtained whichis smooth and uniform to Sal meme-ll) means 0? and has nostreaks or wrinkles eith'er outside mg Sud ubsmntmny a described" 110 1 on the hand, armrest instants arrangement of" apparatus described' base 'a screw and bloch niimnted iii said base t tlitiittiiitttl itti'tt mt iiiitt adapted front sup ortrng-arm connected to said guide. 1-05 l trunnion c of therectangulaz guiderpiece d;

from the axis of riotatioire of the former f,- and by making the-slot-m slide on the set-screw a after having-unscrewed the latter tone-form the triangle n .m? c in such a hianneras to bring the parts into a position in which the extreme surface of the guide-pieced instead of being in the position'shown in Fig; e., in

=the lane indicated by-the line m'yplace's itself on one side or the other of this plane. Consequently it is possible to displace the position of the guide din one direction or the other along the-tube g'withoutchanging the p former f nor the guide-piece d. In other axis of rotation c' of the movable former may be varied according to the size ofl the tubes to be bent; according to the radiusoi eurvatureto be obtained, and'accordlng'to the nature of the metal of the tube 9. This l variation is'of great practical advantage, as It allows of excellent results being obtained w oids ,xby means 7 ofthis adjustment the disvery small tubesand;

l in allcases even with. 1 smallradiiof curvature. 4 v It'is to beunderstood thatfthezinvention is not exclusively limited'to the arrangement shown. in the drawing-and herein-described merely by way of exam le; because the appliance' might just as wel be devised in sucha manner 'that'the formerf be made to'be sta 5 tionaryand thatthe whole system ami k m be I l i at one end to' said front supporting-arm andat the other end to said base, a slotand-pin' v connection'forsaid base and back supCFQrt- 'ing-ar'm, a mandrel comprising a. cylin body having deformable segments pivotallly' connected thereto by means of a jointed be t and nuts, a rod connected at one end to said mandrel and at the other end to said front o J said base, a clamping member rigidly atta'ehed'to said former, and a handle attachedfr to said former andad'apted'to actuatefthe:

same; substantiallyas described. 4'. In an appliance of thekid described, 2

in combination: a" basesplate, a triangulardeformable frame mountedon said -base-.

plate, a former capable of. rotating on apiyot supported by said base} late, means for turning said former, means or clamping: the tube 25 to be bent on tl1e.forn1e1 ,a mandrel fastened at one end near one of the apices of the de- 5 formable frame and entering at'its other-end [the tube to be bent,'mea'ns for adjustingsaid mandrel longitudinally, a rectangular guid at one en ,a backsupporting-arm connected rioal X I o;

{guvporting-arr'n, a former pivotally mounted: I 1 5 piece pivoting on anaxis coinciding with 1 another apex' of the deformable frame, said guide-piecehaving a straight active surface to support the tube to be bent, on the outside, means for shifting atwill the axis on which" said guide-piece is pivoted to and from the center of rotation of the former and means for deformin the deformableframe in order to vary the inc ination of the axis of the mandrel and of the tube to be bent with regard to T the base-plate in order to allow, concurrently with the movement of displacement of the, axis of oscillation of the guide-piece, the shifting of the same to or from the centerof rotation of the former, and the distance between the point of application of the resultant of pressure applied to the tube and the'center of rotation of the turning former to be varied,

substantially 'as' described and as shown in the accompanying drawings."

- 5. In an appliance of the kind described in combination: a base-plate,;a former pivoted on a stud at one-end of the base-plate, a rigid rod connectedat one end by means of an ad-.

justablejoint to the other end of said baseplate, a bar pivoted at one end at the other end of said rod, a carriage which is longitudinally movable on the baseplate and is pivotally mounted at the otherend of said bar,

means for shifting the carriage along the baseplate, a mandrel adjustable in'the direction of its length fastened at one end at the errtreme end of saidbar near the point where it is :jointed at said rod and entering, at its FLEURY VICTOR MARIUS MONNET. EMILE JULIEN AUGUSTE MOYNE.

Witnesses: I

LoUIs RINERY, FRANK H. MASON. 

